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Title: New Standards And Techniques For Testing Cmm Software, Asme B89.4.10 And ISO 10360-6
Author: Dr. Paul D. Thomas
Source: 2004 Measurement Science Conference
Year Published: 2004
Abstract: When a Coordinate Measuring Machine (CMM) measures a feature on a part, the CMM software performs a best-fit calculation to construct a substitute feature from the raw data. The geometric dimensions and tolerances from the blueprint are then calculated from these substitute features. The best-fit algorithms can be eliminated as a source of error by testing the CMM software off-line, avoiding influences from the operator, the workpiece, the environment, and the CMM hardware. The ASME B89.4.10 1 and ISO 10360-6 2 standards describe a testing procedure to evaluate the performance of CMM software by using reference data sets that have a known, exact solution. These standards describe the minimum number of data sets required and the size, aspect ratio, and location ranges that should be included to completely test the performance of the CMM software. While these standards are intended for evaluating least squares best-fits, the testing method can easily be extended to minimum zone, maximum inscribed, and minimum circumscribed best-fits, which are required by the ASME Y14.5-M 3 and ISO 1101 4 standards on dimensioning and tolerancing.

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